It's amazing how good it feels to ASK about those horrible things & find out that we were wrong. You stood up for yourself, asked the question and improved the way you were going to feel for the whole next week. That's AWESOME.
As far as not thinking about the mother.... when I start to get repetitive, I often force myself to say STOP out loud. Then I try to get up and find something else to do. I'll clean, go for a walk, read PC, etc etc.